Kel Tec PF-9 comes to mind. Internal hammer and single stack 9mm. I'm pretty sure a few guys here have them and there are some reviews. Sig makes a single stack, the P239 IIRC, but it does have an external hammer. You may also consider a 1911 style pistol chambered in 9mm. Again though, external hammer.
As far as racking it, that's going to be one of those hands-on things that only you can decide. If racking the slide is really a problem, have you considered a revolver? If this gun is meant for range only duty, then it doesn't matter much. But if this is for self-defense, then, IMO, you're much better off with 6 rounds of .357 that are ready to go with just a pull of the trigger than 7 or so of 9mm that you have difficulty loading; especially when in a SD situation, time is of the essence.